Pretreatment device for water pollution chromatographic detection

Abstract

The invention discloses a pretreatment device for chromatographic detection of water pollution, and relates to the technical field of sewage detection. Comprising a negative pressure suction part, a sealing part is mounted on the negative pressure suction part, and a row of rotary mounting parts are mounted on the sealing part; one row of rotary mounting pieces are used for shunting activating liquid and leacheate; detection extraction parts are respectively mounted on the row of rotary mounting parts; a negative pressure conduction piece is mounted on the negative pressure suction piece; an activation defoaming piece is mounted on the negative pressure conduction piece; the butt-joint pipe capable of rotating to adjust the position is adopted, so that during actual solid-phase extraction work, a worker does not need to disassemble and assemble a sealing cover for many times, a test tube can be placed on a test tube rack in advance, the liquid drainage direction can be flexibly adjusted through the butt-joint pipe capable of rotating and adjusting subsequently, and the risk of cross contamination is reduced.

Description

Technical Field

[0001] This invention relates to the field of wastewater detection technology, specifically a pretreatment device for chromatographic detection of water pollution. Background Technology

[0002] In practical water pollution detection, when performing chromatographic analysis on wastewater, pretreatment using a solid-phase extraction (SPE) device is necessary. SPE facilitates subsequent chromatographic analysis. SPE typically involves adsorbent activation, sample loading, rinsing, and then elution and collection. Current pretreatment devices for water pollution chromatographic analysis usually employ fixed extraction columns. The initial activation process produces wastewater, which typically requires activating the extraction column, adding the sample, rinsing, cumbersome disassembly of the cap, reinstallation of test tubes on the rack, and reassembly. This process is prone to cross-contamination, and the initial activation process is difficult to drain, easily causing liquid droplet splashing and contamination. Furthermore, the traditional method of directly adding the activator and applying negative pressure during adsorbent activation is prone to incomplete activation due to factors such as air bubbles, making it difficult to remove bubbles from the activator.

[0003] Therefore, we propose a pretreatment device for chromatographic detection of water pollution. Summary of the Invention

[0004] The purpose of this invention is to provide a pretreatment device for chromatographic detection of water pollution, in order to solve the problems mentioned in the background art, where current pretreatment devices for chromatographic detection of water pollution typically use fixed extraction columns, which are prone to cross-contamination and are not convenient for defoaming activators.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a pretreatment device for chromatographic detection of water pollution, comprising a negative pressure suction component, a sealing component installed on the negative pressure suction component, and a row of rotary mounting components installed on the sealing component; the row of rotary mounting components is used to separate the activation solution and the eluent.

[0006] Each of the row of rotary mounting components is equipped with a detection and extraction component;

[0007] The negative pressure suction component is equipped with a negative pressure conduction component; the negative pressure conduction component is equipped with an activation defoaming component;

[0008] The negative pressure suction device includes: a negative pressure glass cylinder, on the side of which a drain pipe is fixedly installed; a valve is installed on the drain pipe; a vacuum connection pipe is fixedly installed on the negative pressure glass cylinder, and a valve is provided on the vacuum connection pipe; the vacuum connection pipe is located above the drain pipe.

[0009] Preferably, the negative pressure suction device further includes: a test tube rack, which is fixedly installed inside the negative pressure glass cylinder; a row of test tubes is inserted into the test tube rack; a row of guide tubes is fixedly installed on the test tube rack, and a rubber ring is provided on the top of each of the row of guide tubes; and a vacuum pump is externally connected to the vacuum connection tube.

[0010] Preferably, the sealing component includes: a sealing cover, the inner side of which is provided with a sealing ring; the sealing cover is fitted onto the negative pressure glass cylinder through the inner sealing ring; a row of limiting grooves is formed at the bottom of the sealing cover, and the row of limiting grooves are all arc-shaped structures; a pressure gauge is provided on the sealing cover.

[0011] Preferably, the closure further includes: a row of marking switches, a row of marking switches is fixedly installed on the closure cover, and the ends of the row of marking switches protrude from the closure cover; a row of indicator lights is fixedly installed on the closure cover; and the row of marking switches is electrically connected to the row of indicator lights.

[0012] Preferably, the rotary mounting component includes: a rotary handle, which is rotatably sleeved on the closed cover; a rubber ring is provided on the outer side of the rotary handle; a base plate is fixedly installed at the bottom of the rotary handle, and a limit post is fixedly installed on the base plate, with the limit post located in a limit groove on the same side; a pressing post is fixedly installed at the top of the rotary handle; the pressing post is used to rotary press adjacent marking switches; a torsion spring is sleeved on the rotary handle, and the torsion spring is fixedly connected between the base plate and the closed cover.

[0013] Preferably, the detection extraction component includes: a connecting tube, which is fixedly mounted on a rotary handle; the bottom of the connecting tube is attached to a rubber pad on the top of the guide tube on the same side; the connecting tube is eccentrically positioned on the rotary handle; an opening and closing valve is fixedly mounted on the connecting tube; when the rotary handle is rotated 180 degrees, the connecting tube aligns with the middle of the test tube on the test tube rack on the same side.

[0014] Preferably, the detection extraction element further includes: a solid-phase extraction column, which is inserted into the connecting tube; the solid-phase extraction column is provided with an adsorbent inside.

[0015] Preferably, the negative pressure conducting component includes: a negative pressure suction tube, which is fixedly installed on a negative pressure glass cylinder; and a solenoid valve is fixedly installed on the negative pressure suction tube.

[0016] Preferably, the activated defoaming component includes: a defoaming mounting cylinder, which is fixedly mounted on the negative pressure suction pipe; a pipe end sleeve is fixedly mounted on the front end of the defoaming mounting cylinder; the pipe end sleeve is used to fit and connect the connecting pipe; and a fixing ring is fixedly mounted on the defoaming mounting cylinder.

[0017] Preferably, the activated defoaming component further includes: a control switch, which is fixedly mounted on a fixing ring; a lower pressure sleeve is slidably sleeved on the defoaming mounting cylinder; the outer side of the lower pressure sleeve is provided with a rubber coating; a pressure spring is sleeved on the outer side of the defoaming mounting cylinder, and the pressure spring is located between the lower pressure sleeve and the defoaming mounting cylinder; the tail of the lower pressure sleeve presses against the control switch, and the control switch is electrically connected to a solenoid valve.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] This invention employs a rotatable and adjustable connecting tube. During solid-phase extraction (SPE), operators no longer need to repeatedly disassemble and reassemble the sealing cap. Test tubes can be placed in the test tube rack beforehand, and the drain direction can be flexibly adjusted via the rotatable connecting tube, reducing the risk of cross-contamination. The resiliently resettable rotary handle allows operators to perform SPE on only one connecting tube at a time, avoiding the chaos of simultaneous multi-channel operation and the instability of negative pressure when multiple SPE columns are performing SPE simultaneously. The use of an activation and defoaming element facilitates the activation of the SPE column by using negative pressure to promote the full penetration of the activator into the adsorbent inside the column. This avoids the problem of poor localized activation and penetration of the adsorbent when simply adding the activator at normal pressure and then pumping it out. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of a pretreatment device for chromatographic detection of water pollution according to the present invention;

[0021] Figure 2 This is a cross-sectional view of the internal structure of a pretreatment device for chromatographic detection of water pollution according to the present invention.

[0022] Figure 3 This is a schematic diagram of the rear structure of a pretreatment device for chromatographic detection of water pollution according to the present invention.

[0023] Figure 4 This is a schematic diagram of the negative pressure suction component of the present invention;

[0024] Figure 5 This is a schematic diagram of the closure structure of the present invention;

[0025] Figure 6 For the present invention Figure 1 Enlarged view of the structure of region B in the middle;

[0026] Figure 7 This is a schematic diagram of the rotating mounting component structure of the present invention;

[0027] Figure 8 For the present invention Figure 5Enlarged view of the structure of region C in the middle;

[0028] Figure 9 This is a schematic diagram showing the installation position of the activated defoaming component of the present invention;

[0029] Figure 10 This is a cross-sectional view of the activated defoaming component structure of the present invention.

[0030] In the diagram: 1. Negative pressure suction component; 101. Negative pressure glass cylinder; 102. Drain pipe; 103. Vacuum connection pipe; 104. Test tube rack; 105. Guide pipe; 2. Sealing component; 201. Sealing cap; 2011. Limiting groove; 202. Marking switch; 203. Indicator light; 3. Rotary mounting component; 301. Rotary handle; 3011. Base plate; 3012. Limiting post; 302. Extrusion post; 303. Torsion spring; 4. Detection and extraction component; 401. Connecting pipe; 402. Opening and closing valve; 403. Solid phase extraction column; 5. Negative pressure conduction component; 501. Negative pressure suction pipe; 502. Solenoid valve; 6. Activation and defoaming component; 601. Defoaming mounting cylinder; 6011. Tube end sleeve; 6012. Fixing ring; 602. Control switch; 603. Lower pressure sleeve; 604. Pressure spring. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Example 1: Please refer to Figures 1 to 10 As shown:

[0033] This invention provides a technical solution: a pretreatment device for chromatographic detection of water pollution, comprising a negative pressure suction component 1, a sealing component 2 installed on the negative pressure suction component 1, and a row of rotating mounting components 3 installed on the sealing component 2; the row of rotating mounting components 3 is used to separate the activation solution and the eluent; detection extraction components 4 are respectively installed on the row of rotating mounting components 3; a negative pressure conducting component 5 is installed on the negative pressure suction component 1; an activation defoaming component 6 is installed on the negative pressure conducting component 5; the negative pressure suction component 1 includes: a negative pressure glass cylinder 101, a drain pipe 102, and a vacuum connecting pipe 103, the drain pipe 102 is fixedly installed on the side of the negative pressure glass cylinder 101; a valve is installed on the drain pipe 102; the vacuum connecting pipe 103 is fixedly installed on the negative pressure glass cylinder 101, and a valve is provided on the vacuum connecting pipe 103; the vacuum connecting pipe 103 is located above the drain pipe 102.

[0034] The negative pressure suction component 1 further includes: a test tube rack 104 and a guide tube 105. The test tube rack 104 is fixedly installed inside the negative pressure glass cylinder 101. A row of test tubes is inserted into the test tube rack 104. A row of guide tubes 105 is fixedly installed on the test tube rack 104, and each of the row of guide tubes 105 has a rubber ring at its top. A vacuum connection pipe 103 is connected to a vacuum pump. The sealing component 2 includes: a sealing cover 201 and a limiting groove 2011. A sealing ring is provided on the inner side of the sealing cover 201. The sealing cover 201 is fitted onto the negative pressure glass cylinder 101 through the inner sealing ring. A row of limiting grooves 2011 is opened at the bottom of the sealing cover 201, and each row of limiting grooves 2011 has an arc-shaped structure. The sealing cover 201 is provided with... Pressure gauge; Rotary mounting component 3 includes: a rotary handle 301, a base plate 3011, a limiting post 3012, a pressing post 302, and a torsion spring 303. The rotary handle 301 is rotatably sleeved on the closed cover 201. A rubber ring is provided on the outer side of the rotary handle 301. The base plate 3011 is fixedly installed at the bottom of the rotary handle 301, and the limiting post 3012 is fixedly installed on the base plate 3011, with the limiting post 3012 located in the limiting groove 2011 on the same side. The pressing post 302 is fixedly installed at the top of the rotary handle 301. The pressing post 302 is used to rotary press the adjacent marking switch 202. The torsion spring 303 is sleeved on the rotary handle 301, and the torsion spring 303 is fixedly connected to the base plate 3011 and the closed cover 201. Between the caps 201; the detection extraction component 4 includes: a connecting pipe 401 and an on / off valve 402, the connecting pipe 401 being fixedly mounted on the rotary handle 301; the bottom of the connecting pipe 401 is attached to the rubber ring on the top of the guide tube 105 on the same side; the connecting pipe 401 is eccentrically positioned on the rotary handle 301; the on / off valve 402 is fixedly mounted on the connecting pipe 401; when the rotary handle 301 is rotated 180 degrees, the connecting pipe 401 aligns with the middle of the test tube on the test tube rack 104 on the same side; the detection extraction component 4 also includes: a solid-phase extraction column 403, the solid-phase extraction column 403 being inserted into the connecting pipe 401; the solid-phase extraction column 403 contains an adsorbent, and uses the rotatable and adjustable connecting pipe 401. In actual solid-phase extraction, the operator does not need to repeatedly disassemble and reassemble the sealing cap 201. The test tube can be placed in the test tube rack 104 in advance. The discharge direction can be flexibly adjusted by the rotatable and adjustable connecting tube 401 to reduce the risk of cross-contamination. At the same time, the guide tube 105 can be used to assist in the flow when discharging activation, sample loading and eluent in the early stage of connecting tube 401, avoiding splashing and contamination of connecting tube 401 and test tube. The structure and operation are simple. With the flexible rotating handle 301, the operator can keep the solid-phase extraction of one connecting tube 401 at a time during the actual operation of chromatographic solid-phase extraction, avoiding the extraction of multiple connecting tubes 401 at the same time.Observe the pressure gauge on the sealed cap 201. After the pressure reaches the target level, add an activator to the solid-phase extraction column 403 to activate the adsorbent inside the column. Then, open the valve on the connecting pipe 401. Under the negative pressure inside the negative pressure glass cylinder 101, the activator can be quickly discharged through the connecting pipe 401. The discharged waste liquid can be discharged directly through the guide pipe 105 after being discharged from the connecting pipe 401. The valve on the drain pipe 102 can be opened to discharge the wastewater accumulated at the bottom of the negative pressure glass cylinder 101. When elution of the solid-phase extract in the adsorbent is required, first add eluent to the solid-phase extraction column 403, then rotate the rotary handle 301 180 degrees, aligning the connecting pipe 401 with the middle of the test tube on the test tube rack 104 on the same side. After the pressure reaches the target level, open the valve on the connecting pipe 401 to discharge the eluent for subsequent chromatographic detection.

[0035] The sealing component 2 also includes: a marking switch 202 and an indicator light 203. A row of marking switches 202 is fixedly installed on the sealing cover 201, and the ends of the row of marking switches 202 protrude from the sealing cover 201. A row of indicator lights 203 is fixedly installed on the sealing cover 201. The row of marking switches 202 is electrically connected to the row of indicator lights 203. The use of the sealing component 2 makes it easier for staff to mark the solid phase extraction column 403 after use, making it easier for staff to distinguish. The structure is more reasonable and flexible. When the staff rotates the rotary handle 301 to perform elution, it will drive the squeezing column 302 to rotate together, squeezing the marking switch 202 and controlling the corresponding indicator light 203 to light up to indicate.

[0036] In Example 2, based on Example 1, the negative pressure conducting component 5 includes: a negative pressure suction pipe 501 and a solenoid valve 502. The negative pressure suction pipe 501 is fixedly installed on the negative pressure glass cylinder 101; the solenoid valve 502 is fixedly installed on the negative pressure suction pipe 501. The activation and defoaming component 6 includes: a defoaming mounting cylinder 601, a pipe end rubber sleeve 6011, and a fixing ring 6012. The defoaming mounting cylinder 601 is fixedly installed on the negative pressure suction pipe 501; the front end of the defoaming mounting cylinder 601 is fixed... A pipe end sleeve 6011 is installed; the pipe end sleeve 6011 is used to fit and connect the butt joint pipe 401; a retaining ring 6012 is fixedly installed on the defoaming mounting cylinder 601; the activated defoaming component 6 also includes: a control switch 602, a lower pressure sleeve 603, and a pressure spring 604, the control switch 602 is fixedly installed on the retaining ring 6012; the lower pressure sleeve 603 is slidably sleeved on the defoaming mounting cylinder 601; the outer side of the lower pressure sleeve 603 is provided with a rubber coating; the outer side of the defoaming mounting cylinder 601... A pressure spring 604 is fitted and located between the lower pressure sleeve 603 and the defoaming mounting cylinder 601. The tail of the lower pressure sleeve 603 is used to squeeze the control switch 602, which is electrically connected to the solenoid valve 502. The use of the activation defoaming component 6 facilitates the activation of the solid phase extraction column 403 by the operator. It helps to promote the full penetration of the activator into the adsorbent inside the solid phase extraction column 403 by using negative pressure. This avoids the problem of poor local activation and penetration of the adsorbent after the activator is added at normal pressure and then simply pumped out. By increasing the activation and penetration, the quality of subsequent solid phase extraction can be improved. At the same time, by pressing the lower pressure sleeve 603, the defoaming mounting cylinder 601 is driven to press down on the solid phase extraction column 403, and the negative pressure suction is controlled to ensure the fit between the tube end sleeve 6011 on the defoaming mounting cylinder 601 and the solid phase extraction column 403.

[0037] The working principle of this embodiment is as follows: First, insert test tubes into the test tube rack 104, then cover the negative pressure glass cylinder 101 with the sealing cap 201. First, turn on the vacuum pump connected to the vacuum connection tube 103 to perform suction. Observe the pressure gauge on the sealing cap 201. After the pressure reaches the target, add an activator into the solid phase extraction column 403 to activate the adsorbent inside the solid phase extraction column 403. Then, open the valve on the connecting tube 401. Under the negative pressure inside the negative pressure glass cylinder 101, the adsorbent can be drawn through the connecting tube 401. 01. Quickly discharge the activator, then temporarily close the valve on the connecting pipe 401. Add wastewater sample into the solid-phase extraction column 403. After the negative pressure inside the negative pressure glass cylinder 101 reaches the standard, reopen the valve on the connecting pipe 401 to perform solid-phase extraction using the adsorbent. Then close the valve on the connecting pipe 401 again, add eluent into the solid-phase extraction column 403, and perform rinsing. Open the valve on the connecting pipe 401 to discharge the eluent. The wastewater discharged above can be discharged from the connecting pipe 401. The wastewater can be discharged directly through the guide pipe 105. The valve on the drain pipe 102 can be opened to discharge the wastewater accumulated at the bottom of the negative pressure glass cylinder 101. When elution of the solid-phase extract in the adsorbent is required, eluent is first added inside the solid-phase extraction column 403. Then, the rotary handle 301 is rotated 180 degrees, aligning the connecting pipe 401 with the middle of the test tube on the test tube rack 104 on the same side. Once the pressure reaches the target, the valve on the connecting pipe 401 can be opened to discharge the eluent, facilitating subsequent chromatographic detection. The staff needs to hold the rotary handle 301 continuously; otherwise, the rotary handle 301 can be automatically rotated and reset under the elastic torque of the torsion spring 303, which makes it convenient for the staff to hold the handle one by one during the actual operation of the washing and desiccation work. The limiting post 3012 is located in the limiting groove 2011 to stop and limit the movement. When the staff rotates the rotary handle 301 to perform washing and desiccation, it will drive the squeezing post 302 to rotate together, and the squeezing mark switch 202 will control the corresponding indicator light 203 to light up to indicate the operation.

[0038] After each addition of activator to the solid-phase extraction column 403, the defoaming installation cylinder 601 can be fitted onto the solid-phase extraction column 403. The pressure sleeve 603 can then be manually pressed down to compress the pressure spring 604. At this time, the tube end rubber sleeve 6011 will tightly press down on the solid-phase extraction column 403 to maintain a seal. When the pressure sleeve 603 moves down, it will no longer press the control switch 602, thus controlling the solenoid valve 502 to open. The negative pressure inside the negative pressure glass cylinder 101 will directly connect to the defoaming installation cylinder 601, and the activator inside the solid-phase extraction column 403 will be drawn in by the negative pressure to remove bubbles, promoting the penetration of the activator into the adsorbent.

[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pretreatment device for chromatographic detection of water pollution, comprising a negative pressure suction component (1), wherein a sealing component (2) is installed on the negative pressure suction component (1), characterized in that: A row of rotary mounting parts (3) is installed on the closure (2); the row of rotary mounting parts (3) is used to separate the activation liquid and the rinsing liquid; A detection extraction element (4) is installed on each of the row of rotary mounting parts (3); The negative pressure suction component (1) is equipped with a negative pressure conduction component (5); the negative pressure conduction component (5) is equipped with an activation defoaming component (6). The negative pressure suction device (1) includes: a negative pressure glass cylinder (101), on which a drain pipe (102) is fixedly installed; a valve is installed on the drain pipe (102); a vacuum connection pipe (103) is fixedly installed on the negative pressure glass cylinder (101), and a valve is provided on the vacuum connection pipe (103); the vacuum connection pipe (103) is located above the drain pipe (102).

2. The pretreatment device for chromatographic detection of water pollution according to claim 1, characterized in that: The negative pressure suction device (1) further includes: a test tube rack (104), which is fixedly installed inside the negative pressure glass cylinder (101); a row of test tubes is inserted on the test tube rack (104); a row of guide tubes (105) is fixedly installed on the test tube rack (104), and a rubber ring is provided on the top of each of the row of guide tubes (105); and a vacuum pump is connected to the vacuum connecting pipe (103).

3. The pretreatment device for chromatographic detection of water pollution according to claim 2, characterized in that: The sealing component (2) includes: a sealing cover (201), the inner side of which is provided with a sealing ring; the sealing cover (201) is sleeved on the negative pressure glass cylinder (101) through the inner sealing ring; a row of limiting grooves (2011) is opened at the bottom of the sealing cover (201), and the row of limiting grooves (2011) are arc-shaped structures; a pressure gauge is provided on the sealing cover (201).

4. The pretreatment device for chromatographic detection of water pollution according to claim 3, characterized in that: The closure (2) further includes: a marker switch (202), a row of marker switches (202) is fixedly installed on the closure cover (201), and the ends of the row of marker switches (202) protrude from the closure cover (201); a row of indicator lights (203) is fixedly installed on the closure cover (201); and the row of marker switches (202) is electrically connected to the row of indicator lights (203).

5. The pretreatment device for chromatographic detection of water pollution according to claim 4, characterized in that: The rotary mounting component (3) includes: a rotary handle (301), which is rotatably sleeved on the closed cover (201); a rubber ring is provided on the outside of the rotary handle (301); a base plate (3011) is fixedly installed at the bottom of the rotary handle (301), and a limiting post (3012) is fixedly installed on the base plate (3011), and the limiting post (3012) is located in the limiting groove (2011) on the same side; a pressing post (302) is fixedly installed at the top of the rotary handle (301); the pressing post (302) is used to rotary press the adjacent marking switch (202); a torsion spring (303) is sleeved on the rotary handle (301), and the torsion spring (303) is fixedly connected between the base plate (3011) and the closed cover (201).

6. The pretreatment device for chromatographic detection of water pollution according to claim 5, characterized in that: The detection extraction component (4) includes: a connecting tube (401), which is fixedly installed on the rotary handle (301); the bottom of the connecting tube (401) is attached to the rubber pad on the top of the guide tube (105) on the same side; the connecting tube (401) is eccentrically set on the rotary handle (301); an opening and closing valve (402) is fixedly installed on the connecting tube (401); when the rotary handle (301) is rotated 180 degrees, the connecting tube (401) is aligned with the middle of the test tube on the test tube rack (104) on the same side.

7. A pretreatment device for chromatographic detection of water pollution according to claim 6, characterized in that: The detection extraction element (4) further includes: a solid phase extraction column (403), which is inserted into the connecting tube (401); the solid phase extraction column (403) is provided with an adsorbent inside.

8. A pretreatment device for chromatographic detection of water pollution according to claim 1, characterized in that: The negative pressure conducting component (5) includes: a negative pressure suction tube (501), which is fixedly installed on the negative pressure glass cylinder (101); and a solenoid valve (502) is fixedly installed on the negative pressure suction tube (501).

9. A pretreatment device for chromatographic detection of water pollution according to claim 8, characterized in that: The activated defoaming component (6) includes: a defoaming mounting cylinder (601), which is fixedly mounted on the negative pressure suction pipe (501); a pipe end sleeve (6011) is fixedly mounted on the front end of the defoaming mounting cylinder (601); the pipe end sleeve (6011) is used to fit and connect the connecting pipe (401); and a fixing ring (6012) is fixedly mounted on the defoaming mounting cylinder (601).

10. A pretreatment device for chromatographic detection of water pollution according to claim 9, characterized in that: The activated defoaming component (6) further includes: a control switch (602), which is fixedly mounted on a fixing ring (6012); a lower pressure sleeve (603) is slidably sleeved on the defoaming mounting cylinder (601); the lower pressure sleeve (603) is provided with a rubber coating on its outer side; a pressure spring (604) is sleeved on the outer side of the defoaming mounting cylinder (601), and the pressure spring (604) is located between the lower pressure sleeve (603) and the defoaming mounting cylinder (601); the tail of the lower pressure sleeve (603) squeezes the control switch (602), and the control switch (602) is electrically connected to a solenoid valve (502).

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